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RE 280 MK2

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Содержание RE 280 MK2

Страница 1: ...RE 280 MK2 ...

Страница 2: ...ic circuit designs has not done the technology any favours Today s loudspeakers and source equipment provide better performance than ever before but also make greater demands on amplifiers Modern sound reproduction equipment delivers a level of performance at a price that simply would not have been possible 20 or even 10 years ago These advances have been achieved through the application of cuttin...

Страница 3: ...lifier 10 3 2 Burning in 10 4 Operation Front panel 11 5 Connections Rear panel 12 6 Bias measurement facility 13 6 1 How it works 13 6 2 Setting the bias 14 7 Tubes 7 1 Tube layout 15 7 2 Tube service life 15 7 3 Removing the grille 16 7 4 Replacing tubes 16 8 Using the Black Box or Super Black Box 17 8 1 Option External Black Box 17 8 2 Option External Super Black Box 18 9 Troubleshooting 19 10 ...

Страница 4: ...er Management Power supply and other functions Amplifier Sound Quality OCTAVE amplifiers are equipped with a proprietary control and moni toring system we call Power Management This is an electronic brain within the amp that regulates and controls all of the amplifier s func tions It includes the Soft Start Electronics that gently ramp up the heating and supply voltages to save wear and tear on th...

Страница 5: ...th an electronic protection system as a matter of course LOAD STABIL ITY The technical breakthroughs that set the original RE 280 apart were its op timized input gain section and power supply Indeed it used a totally new power supply design featuring double star earthing and supply voltage iso lation The optimization of the input stage provided absolute immunity from influences such as the loudspe...

Страница 6: ...ly by a qualified technician Fuses should also only be changed by a qualified technician Always replace fuses with ones of the same type and rating If your amplifier requires servicing please ship or take your equipment directly to OCTAVE or to one of our author ized service centres Explanation of the warning symbols The exclamation point within an equilateral triangle is intended to alert the use...

Страница 7: ...e the unit near flammable materials gases or vapours Avoid areas where there may be heavy accumulations of dust or where the unit may be subject to mechanical vibration Place your OCTAVE amplifier on a stable even surface 2 Grille Never operate the amplifier without the protective grille 3 Ventilation Make sure that your amplifier has a good flow of air around it If you intend to install your equi...

Страница 8: ...tch for the RE 280 MK2 is located on the front panel see Chapter 4 Operation There is no muting or standby facility When you switch on the warm up LED next to the power switch illuminates The unit is ready for use after about two minutes 7 Check that the volume control is not set at maximum before playing music through the amplifier 8 Switch the other components on in any order 3 2 Running in All ...

Страница 9: ...led Position V1 V4 The measurement facility is connected to the relevant tubes To ensure the accuracy of any adjustments be sure to set the volume control to 0 NOTE The RE 280 MK2 is equipped with a soft start circuit and a power up delay timer The amplifier is ready for use after a delay of approximately 3 minutes Because there are no relays in the signal path a low level slightly distorted signa...

Страница 10: ... your speakers take care to connect the red terminals on your amplifier to the positive terminal on your speakers The blue negative terminals connect to the negative terminals on your speakers Black Box and Super Black Box connection The Black box and Super Black Box are outboard power supply upgrades for the power amplifier see p 14 15 The RE 280 MK2 must be switched off using the power switch be...

Страница 11: ...ugh the grille using a long screwdriver The trimmers are located next to their respective tubes Next to each trimmer you will see a pilot lamp which shows which tubes have been selected with the bias selector switch A row of LEDs in front of the transformer cover assists you in setting the bias correctly It shows three conditions bias too low correct and too high The LED display green LED OK Setti...

Страница 12: ... If the yellow LED illuminates the bias is set too low turn the trimmer clockwise until the OK LED illuminates Repeat this procedure with the other three tubes 4 Switch the bias selector back to its off position Note If the orange burn in LED lights up at the same time as the yellow LED when you are adjusting the bias it will be impossible to get the green LED to come on This combination of LEDs s...

Страница 13: ...ress on the amplifier and to protect it should a fault develop You can select tubes by measuring their characteristics but this does not guarantee that they will last for a long time Indeed it is impossible to predict how long output tubes will last A well made tube has a life expec tancy of between 3 and 5 years However it remains impossible to detect certain weaknesses in the structure of a full...

Страница 14: ...ed turn all bias adjustment controls they look like little screws counter clockwise as far as they will go These are ten turn potentiometers i e it takes ten revolutions to go from the maximum to the minimum setting 2 Switch the amplifier on After the start up period both the minus the burn in LEDs should light up for each output tube If the burn in LED for one or other of the tubes is dim or does...

Страница 15: ...d articulation rendering the musical reproduction clearer throughout the entire frequency range The amplifier remains unaffected by mains varia tions and interferences due to the noise filtering characteristics of the capacitors Black Box Connector LED The LED lights up continuously when the power amplifier is on The LED goes out when the protec tion circuitry trips This is normal as the protectio...

Страница 16: ...lluminates for about 2 sec onds This indicates that the rapid discharge circuit is discharging the electrolytics in the SBB The discharge circuit also activates if the SBB connecting cable is removed accidentally This makes it impossible for an SBB to contain a dangerous charge while it is disconnected Dimensions and weight Dimensions Width x height x depth 203 x 159 x 320 mm Weight Approx 7 5kg C...

Страница 17: ...ording devices Solution Unplug all non essential components cables from your preamp Swap channels to check your speaker and interconnect cables You will generally be able to locate the fault if it changes channel or disappears altogether Tube faults There are 3 different symptoms indicating a faulty tube 1 Broken heater filament the tube stops glowing 2 Defective cathode layer the tube glows but n...

Страница 18: ...ith plated through holes using 130µm copper ceramic tube bases with silver contacts specially selected and burned in longlife tubes professional low inductance electrolytic capacitors LH grade 105 C available in a range of anodized colours General Power consumption 160W minimum 320W at full power Weight 25 kg Standard accessories Power cable 3mm slotted screwdriver 1 spare KT88 6550 tube Dimension...

Страница 19: ... 02 0 05 0 1 0 2 0 5 1 2 30 20k 50 100 200 500 1k 2k 5k 10k Hz 1 2 3 Kmin 0 025 Curve 1 Bias adjusted correctly Curve 2 Bias 10 out Curve 3 Bias 30 out Frequency response 6 2 5 4 3 2 1 0 1 d B r A 10 80k 20 50 100 200 500 1k 2k 5k 10k 20k 50k Hz Between 10Hz and 90kHz the frequency response tolerance is just 0 3dB ...

Страница 20: ...0001 100 0 001 0 01 0 1 1 10 50 30 20k 50 100 200 500 1k 2k 5k 10k Hz The total harmonic distortion curve is very linear increasing only slightly at the lowest frequencies This performance is only possible using a highly specialist output transformer ...

Страница 21: ...ecome evident at higher listening levels If fault 3 occurs the protection circuits will normally switch the amplifier off You may also hear loud background noises just before it switches off but these will not harm the amplifier 4 Is there a loss of sound quality as tubes age No Tubes normally sound the same throughout their life Our soft start technology contributes greatly to extending the servi...

Страница 22: ... special cables with tube amplifiers Speaker cable can exhibit high values of capacitance and inductance Tube power amplifiers deal with such loads better than transistor power ampli fiers The only exception would be in the case of tube preamp to power amp interconnect ca ble longer than 5 metres In this instance a low capacitance cable is advisable 9 Why are balanced inputs rarely seen on integra...

Страница 23: ...e de We reserve the right to alter and improve the specifications in pursuit of better OCTAVE logo is a registered trade mark of Andreas Hofmann Copyright by Andreas Hofmann Reproduction in whole or part is prohibited edited EN2010 ...

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